Muscles like the piriformis (in the gluteal region), the psoas major (deep hip flexor), or the rotator cuff muscles sit far beneath major superficial groups like the gluteus maximus or the trapezius.

When a device or therapist works "inside" the muscle, they are often targeting the —the deep connective tissue web that is frequently the root cause of stubborn restrictions. By applying mechanical pressure, the central nervous system is signaled to release neurotransmitters like serotonin and dopamine, which promotes total body relaxation and faster recovery. Benefits for Different Lifestyles